EP 1025363 A1 2000-08-09 - POSITIVE-DISPLACEMENT PUMP

Title (en)

Title (de)

Title (fr)

Publication

Application

Priority

DE 19745448 A 19971015

EP 9806401 W 19981009

Abstract (en)

[origin: DE19745448C1] The pump has a casing (1) with a rotor (3) and a ring (4) with a drive plate (5). The latter define working chambers with control plates (8,9) and a by-pass flow control valve (11) with a piston (11A) for regulation of a working stream. The throttle of the valve has a shutter (12) with a cross sectional face increased with a rise in the shutter pressure. The piston is moved against a spring (15) through a pressure exerted on the shutter, so that the cross sectional surface of the shutter is dependent on the pressure variation.